Refreshing a page in a WebView android

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i'm working on an Android Application who use webview for displaying somes pages.
I've an action bar and an action tab bar. On the action bar i've 2 buttons, one open a login page and the second must refresh the current page in the webview.
Here is the code of the fragment where the webview is :
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View V = inflater.inflate(R.layout.main_screen, container, false);
WebView webView = (WebView)V.findViewById(R.id.webView_main);
WebSettings webSettings = webView.getSettings(
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